From: Jens Axboe <jens.axboe@oracle.com>
Date: Thu, 29 May 2008 07:32:08 +0000 (+0200)
Subject: cfq-iosched: properly protect ioc_gone and ioc count
X-Git-Tag: v2.6.27-rc1~1114^2~36
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=9a11b4ed0e7c44bca7c939aa544c3c47aae40c12;p=pandora-kernel.git

cfq-iosched: properly protect ioc_gone and ioc count

If we have multiple tasks freeing cfq_io_contexts when cfq-iosched
is being unloaded, we could complete() ioc_gone twice. Fix that by
protecting ioc_gone complete() and clearing with a spinlock for
just that purpose. Doesn't matter from a performance perspective,
since it'll only enter that path when ioc_gone != NULL (when cfq-iosched
is being rmmod'ed).

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
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